_:vb50939405 . _:vb50939405 . _:vb50939405 "A hypomyelinating leukodystrophy characterized by autosomal recessive inheritance of delayed psychomotor development and other neurologic features associated with hypomyelination that has_material_basis_in homozygous or compound heterozygous mutation in the POLR1C gene on chromosome 6p21."^^ . _:vb50939405 . _:vb50939405 "url:https://www.ncbi.nlm.nih.gov/pubmed/26151409"^^ . _:vb50939405 . _:vb50939405 .